Bài 1: a) Tính tổng \(M=3\frac{1}{417}.\frac{1}{762}-\frac{1}{139}.4\frac{761}{762}-\frac{4}{417.762}+\frac{5}{139}\)
b, Tính giá trị của đa thức sai tại x=-1 : \(x^2+x^4+x^6+x^8+....+x^{100}\)
\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}.\left(\frac{2}{3}\right)\)
Làm tính nhân
a) ( -5x2 ) ( 3x3 - 2x2 + x - 1 )
b) ( -43 + \(\frac{2}{3}y\) - \(\frac{1}{4}yz\) ) ( \(-\frac{1}{2}xy\) )
cho \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)
tinh P=\(\frac{y+z-x}{x-y+z}\)
tìm x biet
\(\frac{1}{x}< 2va\frac{1}{x}>-3\)
(1+2+3+4+...+100)\(\times\)(18,34-9,68):(\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}\))
Giúp mik với!~~~
D=(\(\frac{-1}{9}^3\)).\(a^6\).\(b^9\).\(c^3\)
D= \(\left(\frac{-1}{729}\right)\).\(a^6.b^9.c^3\)
\(S^2:\)
\(\left(\frac{-1}{5}\right)^{300}\)và \(\left(\frac{-1}{3}\right)^{500}\)
Tìm x:
\(\dfrac{x}{-18}=\dfrac{-50}{x};\\ 1\dfrac{1}{3}:\left(-0,08\right)=\dfrac{2}{3}:\left(-0,1x\right);\\ x=\dfrac{a}{b+c}=\dfrac{b}{c+a}=\dfrac{c}{b+a};\\ \dfrac{x^2}{6}=\dfrac{24}{25};\dfrac{x+1}{x-5}=\dfrac{0,5}{0,6};\\ \dfrac{2}{3}x:\dfrac{1}{5}=1\dfrac{1}{3}:\dfrac{1}{4};\\ 1,35:0,2=1,25:0,1x\)
